a b g

Steps: clear cache and history, then load this page, then do F5 and do Ctrl+F5

Actual results in Chrome 29.0.1547.57: a) after Ctrl+F5, the box height is 107px and there is a 7px tall red line;
b) after F5, the box height is 100px and there is no red.

Expected results: the box height is always 100px and there is no red.